Micrometer.



H. LwHURDlCK. MICROMEJER. APPLICATION FILED JUNE 24. 1914.

1,174,052. '7 Patehted Mar. 7,1916.

HILAND L. BURDICK, or GREENFTELD, MASSACHUSETTS.

MICROMETER.

Specification of Letters Patent.

Patented Mar. 7, 1916.

Application filed June 24, 1914." Serial No. 347,061.

To all whom it may concern:

Be it known that I, HILAND L. BURDICK, citizen of, the United States, residing at Greenfield, in the county of Franklin and State of Massachusetts, have invented cer-' tam new and useful Improvements 1n M1 crometers, of which the following is a specification.

This inventionrelates to an improvement in micrometers or gages for taking the measurements of threads of screw-threaded arti ment, instead of, as heretofore required, a

separate instrument for each size of pitch.

The invention relates to still other novel features of construction and combinations of parts which will be herein-after more fully described and pointed out in the claims.

In the accompanying drawings: Figure 1 is a view in elevation greatly enlarged (Fig. 2 is an enlarged vertical sectional view; Fig. 3 is an enlarged plan view of the anvil, and Fig. 4 is a view showing the improved a'nvil attached to a micrometer.

A represents the anvil holder, which is adapted to be supported in the frame B of the micrometer C. The anvil holder A is. preferably provided with a bifurcated or" forked end 2. Mounted between the forked end 2 of the anvil holder is a cylindrical anvil 3, which is held between the forked end by a screw 4. Upon the peripheral face of the anvil 3 is a plurality of sets of teeth 5, 5, each set consisting of two teeth, the teeth of each set being ,of a different size, that is, no two sets of teeth, are alike, as the teeth of the various sets are of different thicknesses, and

the furrows between the teeth are of difi'erout depths so that by placing the thread between the two teeth of a set and the point of the micrometer C the pitch diameterof a but may be made to measure a thread of any.

degree or pitch.

When it is desired to turn the anvil for bringing the proper set of teeth into the de- SI Ied position for measuring as to the pitch diameter of a given thread, the set of teeth will be brought so that they are located at the apex of the forked QHd WhGIGHPOH the screw 4 will be turned for contracting the forked ends to hold the tool against movement.

From the foregoing it will be seen that I have provided a very simple apparatus for obtaining thepitch diameter of threaded articles, and which can be constructed for obtaining measurements'of any pitch, and hence I do not wish to limit myself to the exact construction and arrangement herein set forth, but i I claim:

1. An attachment for micrometers comprising an anvil holder having a rotatable member connected thereto, providedwith a plurality of sets of tEEth'OH the periphery thereof, each set consi'stingof two teeth, said teeth being adapted to receive therebetween the thread of a threaded article to be measured for the purpose of obtaining the diameter at the base of the thread of said article.

2. An attachment for micrometers comprising an anvil holder having a rotatable anvil connected thereto, provided with a plurality of sets of teeth on the periphery thereof, each set consisting .of two teeth. means on said anvil holder for holding said anvil where set, whereby the teeth on the anvil may be placed against the thread of a threaded article to be measured and so measure the diameter at the base of the threads of said article.

3. Anattachment for a micrometer comprising an'anvil holder having a forked end, a rotatable member mounted therein provided with a plurality of sets of teeth on the periphery thereof, each set consisting of two teeth, said teeth being adapted to receive therebetween the thread of a threaded article to be measured for the purpose of obtaining Q enema sisting of an anvil holder, an anvil rotatahly In testimony whereof I afiix my signahn'e, mounted tlaemgm, setsefhteeth on saidfzmvg in the presence of two Witnesses.

so mmn e t at 11 on t e rotation 0'- sai anvil the sets of tee t h will successively be in HHJAND BUR-DICK a position to engage the threads of a thread- Witnesses: ed article of which the diameter at the base LYMAN W. GmewoLl), of the threads is to be ascertained. v M. A. SNIDER. 

